How to use Android ViewDragHelper
https://medium.com/@devwilly/how-to-use-android-viewdraghelper-a2c7539ee62e#.rcs401bs8
How to use Android ViewDragHelper
https://medium.com/@devwilly/how-to-use-android-viewdraghelper-a2c7539ee62e#.rcs401bs8
MIT License